It is an object of the invention to provide a portable terminal device having an excellent operability in a voice communication.There are provided a receiver (106) provided on a surface (101g) of a first housing member (101a) which is opposed to a second housing member (101b) in a closing state, a speaker (107) provided on a surface (101i) of the second housing member (101b) which is opposed to the first housing member (101a) in the closing state and having a higher output level than the first voice output means, and a control portion (120) for deciding a positional relationship of the first housing member (101a) with the second housing member (101b) and setting an output source for a voice at the start of a voice communication to either the receiver (106) or the speaker (107) corresponding to a result of the decision.